JP5200898B2 - Inspection method and inspection device for state quantity measuring device of rolling bearing unit - Google Patents

Description

  The state quantity measuring device of the rolling bearing unit which is the object of the inspection method and the inspection apparatus of the present invention is the state quantity such as an external force acting between the stationary side bearing ring and the rotating side bearing ring constituting the rolling bearing unit. Used for measurement. Further, the obtained state quantity is used for ensuring the running stability of a vehicle such as an automobile. The present invention relates to a method and an apparatus for inspecting whether or not a plurality of sensors constituting such a state quantity measuring device for a rolling bearing unit are assembled in a normal positional relationship with a holding member such as a cover.

  For example, automobile wheels are rotatably supported by a suspension device by a double-row angular type rolling bearing unit. In order to ensure the running stability of automobiles, for example, anti-lock braking system (ABS), traction control system (TCS), and electronically controlled vehicle stability control system (ESC) etc. The device is in use. In order to control such various vehicle running stabilization devices, signals representing the rotational speed of the wheels, acceleration in each direction applied to the vehicle body, and the like are required. In order to perform higher-level control, it may be preferable to know the magnitude of a load (for example, one or both of a radial load and an axial load) applied to the rolling bearing unit via a wheel.

  In view of such circumstances, Patent Document 1 describes an invention in which a special encoder is used to measure the magnitude of a load applied to a rolling bearing unit. FIG. 10 shows a first example of a conventional structure relating to a state quantity measuring device for a rolling bearing unit, which employs the same load measurement principle as the structure described in Patent Document 1. In the first example of this conventional structure, a hub 2 that rotates together with a wheel 2 while supporting and fixing the wheel in use is fixed to a plurality of rolling wheels on the inner diameter side of the outer ring 1 that does not rotate while being coupled and fixed to a suspension device. It is rotatably supported via the moving bodies 3 and 3. A preload is applied to each of the rolling elements 3 and 3 together with a contact angle of the rear combination type. In the illustrated example, balls are used as the rolling elements 3 and 3. However, in the case of an automobile bearing unit that is heavy, tapered rollers may be used instead of balls.

  Further, the inner end of the hub 2 in the axial direction (“inner” with respect to the axial direction refers to the center side in the width direction of the vehicle when assembled to the automobile, and is the right side of FIGS. 10 to 11. On the contrary, the width of the vehicle 10-11, which is the outer side in the direction, is referred to as "outside" in the axial direction. The same applies to the entire specification.) The annular encoder 4 is supported and fixed concentrically with the hub 2. Yes. Further, the pair of sensors 6a and 6b is supported and fixed inside the bottomed cylindrical cover 5 which also serves as a holding member described in the claims and closes the inner end opening of the outer ring 1. At the same time, the detection parts of both the sensors 6 a and 6 b are made to face and face the outer peripheral surface, which is the detected surface of the encoder 4. The encoder 4 includes an annular cored bar 7 and a cylindrical encoder body 8 made of a permanent magnet attached and fixed to the outer peripheral surface of the cored bar 7. S poles and N poles are alternately arranged at equal intervals in the circumferential direction on the inner half portion in the axial direction of the outer peripheral surface of the encoder body 8 which is a detected surface. The boundary between these S poles and N poles has a "<" shape with the central portion in the axial direction protruding most in the circumferential direction.

  Further, magnetic detection elements such as a Hall IC, a Hall element, an MR element, and a GMR element are incorporated in the detection portions of the sensors 6a and 6b. And the detection part of both these sensors 6a and 6b is made to adjoin and oppose each one half part of the axial direction of the to-be-detected surface of the said encoder 4, respectively. In the neutral state where an axial load does not act between the outer ring 1 and the hub 2, the most protruding portions in the circumferential direction at the central portion in the axial direction of the S and N poles are the sensors 6 a and 6 b. The installation positions in the axial direction of the respective members are regulated so that they are just located at the center position between the detection parts. At the same time, the installation positions of the sensors 6a and 6b in the circumferential direction are regulated so that the relationship between the detection portions of the sensors 6a and 6b and the phase of change of the detected surface is as specified. Yes.

  In the state measuring device for a rolling bearing unit configured as described above, when an axial load acts between the outer ring 1 and the hub 2, the outer ring 1 and the hub 2 are displaced relative to each other in the axial direction. Accordingly, the phase difference ratio (= phase difference / 1 period) existing between the output signals of both the sensors 6a and 6b, which is information relating to the output signals of the both sensors 6a and 6b, changes. This phase difference ratio is a value commensurate with the action direction and magnitude of the axial load (the direction and magnitude of the relative displacement). Therefore, based on this phase difference ratio, the direction and magnitude of the axial load (the direction and magnitude of the relative displacement) can be determined. Note that the processing for obtaining these is performed by an arithmetic unit (not shown). For this reason, in the memory of this computing unit, an equation or a formula representing the relationship (zero point and gain) between the phase difference ratio and the relative displacement or load in the axial direction, which has been examined in advance by theoretical calculation or experiment. Remember the map.

  Next, FIG. 11 shows a second example of a conventional structure related to a state quantity measuring device for a rolling bearing unit. In the case of the second example of this conventional structure, the relative displacement in the radial direction between the outer ring 1 and the hub 2 or the radial load acting between the outer ring 1 and the hub 2 is measured. ing. For this reason, in the case of this example, the encoder body 8a made of a permanent magnet, which constitutes the encoder 4a together with the annular cored bar 7a, has a ring shape. And the detection part of a pair of sensor 6a, 6b is made to oppose the position of two places shifted | deviated to radial direction among the axial direction side surfaces of this encoder main body 8a which is a to-be-detected surface. On the side surface in the axial direction of the encoder body 8a, the S pole and the N pole are alternately arranged in the circumferential direction, and the shape of the boundary between the S pole and the N pole is a "<" shape. For this reason, when the outer ring 1 and the hub 2 are relatively displaced in the radial direction based on the radial load, the phases of the output signals of the sensors 6a and 6b are shifted from the neutral position. The relative displacement amount, radial load, or moment in the radial direction can be obtained by the same mechanism as in the first example of the conventional structure described above.

  In the case of each conventional structure described above, the encoders 4 and 4a are made of permanent magnets, and the north and south poles are alternately arranged in the circumferential direction on the detection surface of each of the encoders 4 and 4a. The structure to be adopted is adopted. On the other hand, the encoder is made of a simple magnetic material, a solid part such as a convex part, a tongue piece or a column part on the detection surface of the encoder, and a thinning part such as a concave part, a notch or a through hole It is also possible to adopt a configuration in which these are alternately arranged in the circumferential direction. When such a configuration is adopted, permanent magnets are incorporated on the pair of sensor sides.

  In the case of each of the conventional structures described above, the number of sensors that make the detection portion face the detection surface of the encoder is two. On the other hand, although not shown in the drawings, Patent Documents 2 to 4 describe structures in which multidirectional displacement and external force are obtained by setting the number of sensors to three or more.

  By the way, when manufacturing the state quantity measuring apparatus of the rolling bearing unit conventionally known as mentioned above, as shown in FIGS. 10 to 11, the sensors 6a and 6b are connected to the cover 5 as shown in FIGS. It is conceivable to mold in a holder 9 made of synthetic resin held and fixed inside. By adopting such a structure, the sensors 6a and 6b can be easily held and fixed to the cover 5, and the positional relationship between the sensors 6a and 6b is shifted regardless of the use over a long period of time. It can be prevented from moving.

  However, the positional relationship between the sensors 6a and 6b or the positional relationship of the sensors 6a and 6b with respect to the cover 5 is injected at a high pressure into the mold cavity when the holder 9 is injection molded. There is a possibility of being displaced by being pushed by the molten resin. On the other hand, since the sensors 6a and 6b are covered with the synthetic resin including the respective detection parts in the state after injection molding, the positional relationship between the sensors 6a and 6b is accurately regulated as designed. It will not be possible to visually confirm whether or not there is. Therefore, if it is not confirmed by some method whether or not the positional relationship between the sensors 6a and 6b is appropriate, the state quantity measuring device for the rolling bearing unit can be assembled while the positional relationship is not appropriate. There is sex. In this case, if the positional relationships are not appropriate, the state quantity between the outer ring 1 and the hub 2 (the relative displacement between the outer ring 1 and the hub 2, the outer ring 1 and the hub 2 The load and moment acting between the two cannot be obtained with high accuracy.

  If there is a slight deviation from the positional relationship between the sensors 6a and 6b, the zero point (and gain if necessary) of the calculation formula and map in the software installed in the computing unit should be corrected. Thus, the state quantity is obtained while ensuring the required accuracy. However, if the deviation is excessive, it is difficult to obtain the state quantity while ensuring the necessary accuracy, and even if it is obtained, it may be troublesome. That is, a predetermined phase difference (initial phase difference) which is not 0 is generated between the output signals of the sensors 6a and 6b in a neutral state where no external force is applied between the outer ring 1 and the hub 2. It is preferable to set it. This is because the front-rear relationship between the output signals of the sensors 6a and 6b is not reversed as long as the direction of relative rotation between the outer ring 1 and the hub 2 is the same regardless of the direction of the external force. Because of that.

  For example, in the neutral state, the detection units of the sensors 6a and 6b are set to “0” with respect to the magnetization pitch of the encoder body 8 (8a) so that the phases of the output signals of the sensors 6a and 6b are 180 degrees apart. .5 + n (where n is 0 or a natural number) "is preferably shifted in the circumferential direction by the pitch. However, if the amount of displacement of the sensors 6a and 6b in the circumferential direction is “0.2 + n”, “0.8 + n”, or a large deviation from “0.5 + n”, a large external force is applied. In this case, there is a possibility that the front-rear relationship between the output signals of the sensors 6a and 6b is reversed. In such a case, in order to grasp the fact of reversal and obtain the above external force with high accuracy, complicated arithmetic processing is required, and an expensive computing unit with a large processing capacity is required, The speed becomes slow and appropriate control cannot be performed based on the signal representing the external force.

  In view of the circumstances as described above, Japanese Patent Application No. 2007-173929 describes the position of each sensor even if the positional relationship between the sensors incorporated in the state quantity measuring device of the rolling bearing unit cannot be visually confirmed. An inspection method that can determine whether or not the relationship is appropriate is disclosed. 12 to 14 show a first example of the inspection method of the prior invention disclosed in Japanese Patent Application No. 2007-173929. In the case of this example, the state quantity measuring device of the rolling bearing unit shown in FIG. Then, regarding this inspection object, it is determined whether or not the positional relationship between the pair of sensors 6a and 6b in the circumferential direction of the encoder 4 is appropriate.

  When carrying out the inspection method of this example, first, the respective sensors 6 a and 6 b are held and fixed inside the cover 5 via a holder 9 made of synthetic resin. Then, before connecting the cover 5 to the outer ring 1 (see FIG. 10), which is a stationary raceway, as shown in FIG. 12, the opening end of the cover 5 is provided on the mounting frame 11 of the inspection apparatus. The circular mounting hole 12 is supported by an internal fit with a light interference fit (so that the cover 5 can be removed without damaging the cover 5 after inspection). At the same time, the inspection detection surface of the inspection encoder 10 is brought close to and opposed to the detection portions of the sensors 6a and 6b.

The inspection encoder 10 includes an annular metal core 13 made of a magnetic metal plate, and a cylindrical inspection encoder body 14 made of a permanent magnet such as a rubber magnet that is externally fixed to the metal core 13. Of these, the cored bar 13 is externally supported by a rotating shaft (not shown) concentrically with the rotating shaft, and can be driven to rotate at a constant rotational speed in a predetermined direction. Further, the inspection encoder main body 14 has S poles and N poles arranged alternately and at equal intervals in the circumferential direction on the outer peripheral surface which is a surface to be detected. At the same time, the boundary between the S pole and the N pole is parallel to the central axis of the inspection encoder 10. In the case of this example, the pitch (center angle pitch) P _C between the S pole and the N pole existing on the outer peripheral surface of the inspection encoder 10 is the pitch of the encoder 4 constituting the state quantity measuring device. It is the same.

In order to determine whether or not the positional relationship between the sensors 6a and 6b in the circumferential direction is appropriate using the above-described equipment, the inspection encoder 10 is rotated in a predetermined direction at a constant rotational speed. The phase difference existing between the output signals of the sensors 6a and 6b is obtained. For example, as shown in FIG. 13, when the detection units of the sensors 6a and 6b are shifted by “P _C + θ” in the central angle with respect to the circumferential direction, the phases of the output signals of the sensors 6a and 6b are As shown in FIG. 14, it is shifted by t (∝θ). That is, when the detection units of the sensors 6a and 6b are arranged with a center angle shifted by “θ + n · P _C (n is 0 or a natural number)” with respect to the circumferential direction, the deviation of “n · P _C ” is The phase difference of the output signals of the sensors 6a and 6b is not connected, but the shift of “θ” is related to the shift (phase difference t) shown in FIG.

Therefore, based on the phase difference t between the output signals of the sensors 6a and 6b shown in FIG. 14, the suitability of the positional relationship between the sensors 6a and 6b in the circumferential direction is determined. In this case, if the rotational speed of the inspection encoder 10 is known, the suitability of the positional relationship can be determined based on the phase difference t shown in FIG. On the other hand, if the rotational speed is not known, if it is constant, whether or not the positional relationship is appropriate can be determined based on the phase difference ratio (phase difference t / 1 period T, T∝P _C ). That is, when the measured value of the phase difference or the measured value of the phase difference ratio relating to the known rotational speed is within a preset allowable range, the positional relationship is appropriate. Can be judged. On the other hand, when it is not within the allowable range, it can be determined that the positional relationship is not appropriate.

Incidentally, when carrying out the first example of the inspection method of the previous invention described above, the pitch P _C of the S and N poles present on the outer peripheral surface of the inspection encoder 10, the encoder constituting the state quantity measuring device It is not necessary to be the same as the pitch of 4 (see FIG. 10). However, making the pitches of the encoders 10 and 4 the same means that the positional relationship between the sensors 6a and 6b in the circumferential direction can be determined without performing a conversion process regarding the difference in pitch between the encoders 10 and 4. This is preferable from the viewpoint of easily determining suitability.

  Next, FIGS. 15 to 17 show a second example of the inspection method of the prior invention disclosed in the Japanese Patent Application No. 2007-173929. Also in this example, the state quantity measuring device of the rolling bearing unit shown in FIG. Then, regarding this inspection object, it is determined whether or not the positional relationship between the pair of sensors 6a and 6b in the axial direction of the encoder 4 is appropriate.

When carrying out the inspection method of this example, as in the case of carrying out the inspection method of the first example described above, as shown in FIG. 15, the cover 5 holding and fixing the sensors 6a, 6b is inspected. Set to. However, in the case of this example, the structure of the magnetic characteristics of the outer peripheral surface (inspected detection surface) of the inspection encoder body 14a constituting the inspection encoder 10a is different from that of the first example described above. That is, on the outer peripheral surface of the inspection encoder main body 14a, the S poles and the N poles are alternately arranged at equal intervals in the axial direction. At the same time, the boundary between the S pole and the N pole is present on a virtual plane orthogonal to the central axis of the inspection encoder 10a. Also, the boundary is present at a known pitch P _A in the axial direction. The pitch P _A, the sensors 6a, in terms of regulation in relation to the installation position of 6b, except that the direction is changed from the circumferential direction in the axial direction, the same as in the first example described above .

In order to determine the appropriateness of the positional relationship between the sensors 6a and 6b with respect to the axial direction using the equipment as described above, the inspection encoder 10a is translated in the axial direction at a constant speed, A phase difference existing between output signals of the sensors 6a and 6b is obtained. For example, as shown in FIG. 16, when the detection units of these sensors 6a and 6b are shifted by “P _A + α” in the axial direction, the phases of the output signals of these sensors 6a and 6b are shown in FIG. As shown, it is shifted by t (∝α). That is, when the detectors of these sensors 6a and 6b are arranged by being shifted by “α + n · P _A (n is 0 or a natural number)” in the axial direction, the deviation of “n · P _A ” The shift of “α” does not relate to the phase shift of the output signals 6a and 6b, but the shift (phase difference t) shown in FIG. Therefore, based on the phase difference t {or phase difference ratio (phase difference t / 1 period T, T∝P _A )} of the output signals of the sensors 6a and 6b shown in FIG. The suitability of the positional relationship between the sensors 6a and 6b with respect to the axial direction is determined by the same method as in.

  Incidentally, in addition to the first and second examples of the above-described inspection method of the invention, as a method for confirming the appropriateness of the positional relationship between the sensors 6a and 6b, the output signals of the sensors 6a and 6b A method of examining the initial phase difference characteristic {characteristic representing the initial phase difference (or initial phase difference ratio) that is considered to occur during use} is conceivable. That is, the initial phase difference (or initial phase difference ratio) that is considered to be generated during use is desired regardless of whether the positional relationship in the circumferential direction and the positional relationship in the axial direction are not appropriate. It won't be on the street. Therefore, it can be determined whether or not the positional relationship in each direction is appropriate by examining whether or not the initial phase difference characteristic is as desired. Since a predetermined relationship is established between the initial phase difference characteristic and the positional relationship in each direction, the initial phase difference characteristic is the first or second example of the above-described inspection method according to the invention. It can also be calculated using the measurement result. However, in this case, since two types of inspection encoders 10 and 10a different from each other are used in the measurement work of each of these examples, when changing from one measurement work to the other measurement work, the set change (described above) There is a possibility that a measurement error due to the exchange of the inspection encoders 10 and 10a) occurs. Accordingly, an error may occur in the calculation result of the initial phase difference characteristic corresponding to the measurement error.

  On the other hand, the initial phase difference characteristic is determined by the encoder 4 constituting the state quantity measuring device instead of using the inspection encoder 10 in the first example of the inspection method of the prior invention shown in FIGS. This can be obtained by using an inspection encoder having an inspection detection surface having the same structure as that of the detection surface. In this case, since the initial phase difference characteristic can be obtained by using one inspection encoder, the initial phase difference characteristic can be obtained with high accuracy without causing a measurement error due to the change of the setting as described above. However, in this method, if a determination result is obtained that the initial phase difference characteristic is not as desired, the cause (whether each sensor is displaced in the circumferential direction or in the axial direction) ) Until you can not know.

JP 2006-317420 A JP 2006-322928 A JP 2007-93580 A JP 2008-64731 A

  In view of the circumstances as described above, the present invention provides an initial phase difference between the output signals of the sensors in order to check whether or not a plurality of sensors are assembled in a normal positional relationship with respect to the holding member. When obtaining the characteristic, the initial phase difference characteristic can be obtained with high accuracy using one inspection encoder, and a determination result is obtained that the initial phase difference characteristic is not as desired. In order to realize an inspection method and an inspection apparatus capable of confirming whether or not the cause is a displacement of the positional relationship between the sensors in the circumferential direction (whether there is an influence of a displacement in the axial direction). It is a thing.

A state quantity measuring device for a rolling bearing unit to be inspected by an inspection method and an inspection apparatus according to the present invention includes a rolling bearing unit and a state quantity measuring device.
Among these, the rolling bearing unit has a stationary side raceway on the stationary side circumferential surface and does not rotate even when used, and a stationary side raceway that has a rotational side raceway on the rotational side circumferential surface and rotates when used. A ring, and a plurality of rolling elements provided between the stationary track and the rotating track so as to be freely rollable.
The state quantity measuring device includes an encoder, a sensor device supported and fixed to the stationary raceway ring via a holding member, and an arithmetic unit.
Of these, the encoder is supported and fixed directly on a part of the rotation side raceway or via another member, and includes a detection surface concentric with the rotation side raceway. The characteristics of the detected surface are alternately changed with respect to the circumferential direction, and the phase at which the characteristics of the detected surface change with respect to the circumferential direction is at least a part of the width direction of the detected surface with respect to the width direction. It is changing continuously.
Further, the sensor device includes a plurality of sensors, and the detection unit of each sensor is opposed to the detection surface, and the detection unit of at least one of the sensors is connected to the detection surface. The holding member is coupled and fixed to the stationary bearing ring in a state where the phase of the characteristic change is opposed to a portion that continuously changes in the width direction. It is supported. And each said sensor changes the output signal according to the characteristic change of the part which faced its own detection part in the said to-be-detected surface with rotation of the said rotation side track ring.
Further, the computing unit is configured to detect relative displacement between the stationary side raceway and the rotation side raceway and an external force acting between the two raceways based on information on output signals of the sensors. Among these, it has a function of calculating at least one of the state quantities.

Of the inspection method and the inspection device for the state quantity measuring device of the rolling bearing unit according to the present invention, the inspection method described in claim 1 relates to the state signal measuring device for the rolling bearing unit as described above. It is inspected whether the initial phase difference characteristics between the sensors and the positional relationship between the sensors in the circumferential direction of the encoder are appropriate.
In such an inspection method described in claim 1, an inspection encoder is prepared. This inspection encoder has the same surface shape as the detection surface of the encoder (when the detection surface is a cylindrical surface, the detection surface includes a different diameter) (that is, the detection surface is a cylindrical surface). If the detected surface is an annular surface, it has an annular surface shape). Then, the characteristics of the detected surface for inspection are alternately changed in the circumferential direction, and a part of the area of the detected surface for inspection in the circumferential direction is changed with the boundary of the characteristic change being the detected surface of the encoder. The first characteristic change region, which has the same shape and orientation as the boundary of the characteristic change, and exists at a known pitch with respect to the circumferential direction, is also the other part (the remaining part) of the characteristic change boundary. Is a second characteristic change region that has a linear shape parallel to the width direction of the inspection target surface and exists at a known pitch in the circumferential direction. Before the holding member is coupled to the stationary-side race, the inspection encoder is attached to each sensor in a state where the detection portion of each sensor is opposed to the inspection detection surface of the inspection encoder. Rotate at a constant speed. Of the phase difference between the output signals of each sensor generated at this time, the phase difference generated in the first characteristic change region (the detection part of each sensor faces the first characteristic change region). The initial phase difference characteristic between the output signals of these sensors (property representing the initial phase difference (or initial phase difference ratio) that is considered to occur during use) between the output signals of each of these sensors judge. At the same time, based on the phase difference generated in the second characteristic change region (the phase difference in a state where the detection unit of each sensor faces the second characteristic change region), the rotation direction of the inspection encoder The suitability of the positional relationship between the sensors with respect to (= circumferential direction of the encoder) is determined.

When the inspection method described in claim 1 as described above is performed, the structure of each sensor whose positional relationship is to be inspected in the aspect of changing the characteristics of the inspection target surface of the inspection encoder. Select according to (function).
For example, when each of the sensors incorporates a magnetic sensing element such as a Hall IC, a Hall element, an MR element, a GMR element, etc., but does not include a permanent magnet, as described in claim 2, The encoder is made of permanent magnets. Then, the S pole and the N pole are alternately arranged in the circumferential direction of the inspection encoder on the inspection target surface of the inspection encoder.
Alternatively, as described in claim 4, the inspection encoder is made of a magnetic material. Then, a solid portion such as a convex portion, a tongue piece or a column portion and a thinned portion such as a concave portion, a notch or a through hole are formed on the inspection target surface of the inspection encoder. Alternatingly arranged in the circumferential direction. At the same time, a magnetic pole of a permanent magnet is arranged at a position facing the detection portion of each sensor with the inspection encoder interposed therebetween.
On the other hand, when each of the sensors is provided with a permanent magnet together with the magnetic sensing element as described above, the inspection encoder is made of a magnetic material. Then, a solid portion such as a convex portion, a tongue piece or a column portion and a thinned portion such as a concave portion, a notch or a through hole are formed on the inspection target surface of the inspection encoder. Alternatingly arranged in the circumferential direction.

Further, when the inspection method described in claims 1 to 4 as described above is performed, preferably, as described in claim 5, the inspection encoder has a circumference of the inspection target surface. The periodic characteristics of the half halves of the detected surface for inspection are different from the periodic characteristics of the first and second characteristic change areas in the portion between the first and second characteristic change areas with respect to the direction. Use an intermediate area.
Alternatively, as described in claim 6, as the inspection encoder, the inspection object is provided between the first and second characteristic change regions in the circumferential direction of the inspection detection surface. A detector provided with an intermediate region in which the periodic characteristics of both halves in the width direction of the detection surface are different from the periodic characteristics of both the first and second characteristic changing regions is used.
Alternatively, as described in claim 7, as the inspection encoder, a phase difference characteristic is provided between the first and second characteristic change regions in the circumferential direction of the inspection target surface. Those provided with an intermediate region different from the phase difference characteristics of the first and second characteristic change regions are used.
Alternatively, as described in claim 8, the inspection encoder is one in which the periodic characteristics of the first and second characteristic change regions are different from each other.

  An inspection apparatus for a state quantity measuring apparatus for a rolling bearing unit according to claim 9 is the inspection method for a state quantity measuring apparatus for a rolling bearing unit according to any one of claims 1 to 8. In order to carry out, at least the inspection encoder, the support means for supporting the holding member, and the detection part of each sensor held by the holding member opposed to the inspection detection surface of the inspection encoder, Based on the phase difference generated in the first characteristic change region among the phase difference between the rotation drive means for rotating the inspection encoder with respect to each sensor at a constant rotation speed and the output signals of these sensors. The initial phase difference characteristics between the output signals of these sensors are determined to be appropriate, and the rotation direction of the inspection encoder is determined based on the phase difference generated in the second characteristic change region. And a determination means for determining suitability of the positional relationship of the sensor together. Further, when the inspection method described in claim 4 described above is performed, in addition to these, a permanent magnet having its magnetic pole disposed at a position facing the detection portion of each sensor with the inspection encoder interposed therebetween. Is provided.

  According to the inspection method and the inspection device of the state quantity measuring device of the rolling bearing unit of the present invention as described above, in order to inspect whether or not a plurality of sensors are assembled in a regular positional relationship with the holding member, When obtaining the initial phase difference characteristic between the output signals of the sensors, the initial phase difference characteristic is obtained by one measurement operation using one inspection encoder. For this reason, the initial phase difference characteristic can be obtained with high accuracy (without causing a measurement error due to changing the set) and in a short time. In the case of the present invention, the suitability of the positional relationship between the sensors in the rotation direction of the inspection encoder can be determined by the one measurement operation. For this reason, when the determination result that the initial phase difference characteristic is not as desired is obtained, whether or not the cause is a shift in the positional relationship between the sensors with respect to the rotation direction of the inspection encoder ( It is possible to confirm whether or not the deviation in the axial direction has an influence. Therefore, by checking such a cause, it is possible to easily take measures for improving the holding and fixing operation of each sensor with respect to the holding member.

Further, when the present invention is implemented, if the configuration described in claim 5 is adopted, the period of the output signal of the sensor is a portion corresponding to one half of the width direction of the intermediate region provided on the detection surface for inspection. The lengths are different from those corresponding to the first and second characteristic change regions. For this reason, it is easy to discriminate whether the output signal of the sensor is an output signal generated in either of the first and second characteristic change areas, with the portions where the periods have different lengths as marks. it can.
Further, when the present invention is implemented, if the configuration described in claim 6 is adopted, the period of the output signal of the sensor is a portion corresponding to the intermediate region provided on the detection target surface, and the first and second The length is different from the portions corresponding to both characteristic change regions. For this reason, it is easy to discriminate whether the output signal of the sensor is an output signal generated in either of the first and second characteristic change areas, with the portions where the periods have different lengths as marks. it can.
Further, when the present invention is implemented, if the configuration described in claim 7 is adopted, the phase difference (phase difference ratio) between the output signals of the sensors is in an intermediate region provided on the inspection target surface. The corresponding part has a different size from the part corresponding to both the first and second characteristic change regions. For this reason, the phase difference between the output signals of the sensors is generated in any one of the first and second characteristic change regions, with the portion where the phase difference is different as a mark. It can be easily discriminated whether it is a phase difference.
In addition, when employ | adopting the structure described in Claim 5-7 mentioned above, the periodic characteristic of a pair of intermediate | middle area | region provided in the circumferential direction both sides of the 1st characteristic change area | region (2nd characteristic change area | region) of an inspection encoder Alternatively, if the phase difference characteristics are different from each other between these two intermediate regions, it is possible to more easily determine in which region the output signal or the phase difference is generated. When the present invention is carried out, a pair of intermediate regions provided on both sides in the circumferential direction of the first characteristic change region (second characteristic change region) of the inspection encoder are different from each other in the intermediate regions (above-mentioned claims). A pair of different intermediate regions selected from the intermediate regions described in Items 5 to 7 may be employed. Even when such a configuration is adopted, it is possible to more easily determine in which region the output signal or phase difference is generated.
Further, when implementing the present invention, if the configuration described in claim 8 is adopted, the period of the output signal of each sensor includes a portion corresponding to the first characteristic change region and a portion corresponding to the second characteristic change region. Thus, the lengths are different from each other. Therefore, based on the length of this cycle, it can be easily determined whether the output signal of each sensor is an output signal generated in either of the first and second characteristic change regions.
Therefore, if the configuration described in claims 5 to 8 described above is adopted, it is difficult to cause a determination error by the determination unit configuring the inspection apparatus.

[First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1, 2 and 9. In the case of this example, the state quantity measuring device of the rolling bearing unit shown in FIG. Then, with respect to this inspection object, in the state before the cover 5 holding and fixing the pair of sensors 6a and 6b is coupled to the outer ring 1, the initial phase difference characteristics between the output signals of these sensors 6a and 6b {use The characteristic representing the initial phase difference (or initial phase difference ratio) that is considered to occur sometimes} and the appropriateness of the positional relationship between the sensors 6a and 6b in the circumferential direction are determined.

  When carrying out the inspection method of this example, first, the sensors 6a and 6b are held and fixed inside the cover 5 via a holder 9 made of synthetic resin. Thereafter, before the cover 5 is coupled to the outer ring 1, as shown in FIG. 1, the opening end of the cover 5 is provided with a circular mounting hole provided in a mounting frame 11 that is a supporting means constituting the inspection apparatus. 12 is supported by a light interference fit (so that the cover 5 can be removed without damaging after inspection). At the same time, the inspection detection surface of the inspection encoder 10b is brought close to and opposed to the detection portions of the sensors 6a and 6b.

  The inspection encoder 10b includes an annular core 13 made of a magnetic metal plate, and a cylindrical inspection encoder main body 14b made of a permanent magnet such as a rubber magnet that is externally fixed to the core 13. Of these, the metal core 13 is fitted and supported on a rotation shaft constituting a rotation driving means (not shown) concentrically with the rotation shaft so as to be freely rotatable at a constant rotational speed in a predetermined direction. In the inspection encoder body 14b, S poles and N poles are alternately arranged in the circumferential direction on the outer peripheral surface which is a detection target surface. In particular, in the case of this example, in each region of one half portion and the other half portion in the circumferential direction of such a surface to be detected for inspection (each region of 180 degrees not overlapping each other), the S pole and By making the form of the boundary with the N pole different from each other, one half of the area is the first characteristic change area 15 and the other half is the second characteristic change area 16.

  That is, in the case of this example, in the first characteristic change region 15, the shape and direction of the boundary and the central angle pitch are present on the detection surface of the encoder 4 (see FIG. 10) constituting the state quantity measuring device. It is the same as the “K” shaped border. On the other hand, in the second characteristic change region 16, the boundary has a linear shape parallel to the width direction (axial direction) of the inspection target surface and exists on the detection surface of the encoder 4. It exists at the same center angle pitch as the “」 ”-shaped boundary. In the case of this example, as shown in FIG. 1, the above-mentioned cover 5 with respect to the cover 5 with the detection detection surface of the inspection encoder 10 b in close proximity to the detection portion of the sensors 6 a and 6 b. The axial position of the top of the “<”-shaped boundary existing in one characteristic change region 15 is the “<” that exists on the detected surface of the encoder 4 with respect to the cover 5 when the state quantity measuring device is used. It is the same as the axial position of the top of the character-shaped boundary. Therefore, the positional relationship between the end surface of the mounting frame 11 and the inspection encoder 10b is the same as the positional relationship between the end surface of the outer ring 1 and the encoder 4 (see FIG. 10).

  In the case of this example, in the state shown in FIG. 1, the inspection encoder 10b is rotated in a predetermined direction at a constant rotational speed, while the output signals of the sensors 6a and 6b are connected to each other. The phase difference (or phase difference ratio) existing in Then, based on the phase difference (or phase difference ratio) generated in the first characteristic change region 15 among the phase difference (or phase difference ratio), an initial value between the output signals of these sensors 6a and 6b is obtained. The suitability of the phase difference characteristic is determined. That is, it is determined whether or not the initial phase difference characteristic is as desired (within a preset allowable range). At the same time, based on the phase difference (or phase difference ratio) generated in the second characteristic change region 16, the same method as in the first example of the inspection method of the prior invention shown in FIGS. The suitability of the positional relationship between the sensors 6a and 6b in the circumferential direction (the rotation direction of the inspection encoder 10b) is determined. The result of each determination is used as a material for final determination as to whether or not each of the sensors 6a and 6b is assembled in a normal positional relationship with the cover 5. For example, when the initial phase difference characteristic is inappropriate and the positional relationship in the circumferential direction is appropriate, it is determined that the positional relationship in the axial direction is inappropriate. Of course, when the positional relationship in the circumferential direction is inappropriate, the determination is made as it is. Note that these determination operations are performed by a determination device which is a determination means constituting the inspection apparatus.

  As described above, according to the inspection method and inspection apparatus of the state quantity measuring device of the rolling bearing unit of this example, the initial phase difference characteristic between the output signals of the sensors 6a and 6b is used for one inspection. Using the encoder 10b, it is obtained by a single measurement operation. For this reason, this initial phase difference characteristic can be obtained with high accuracy (without causing a measurement error due to changing the set) and in a short time. In the case of this example, the suitability of the positional relationship between the sensors 6a and 6b with respect to the circumferential direction and the axial direction can also be determined by the single measurement operation. For this reason, when the determination result that the initial phase difference characteristic is not as desired is obtained, whether or not the cause is a shift in the positional relationship between the sensors 6a and 6b in the circumferential direction. (Whether or not there is an influence of deviation in the axial direction) can be confirmed. Therefore, by checking such a cause, it is possible to easily take measures for improving the holding and fixing operation of the sensors 6a and 6b with respect to the cover 5.

  Even when the inspection method and the inspection apparatus of this example are implemented, the pitch between the S pole and the N pole existing on the outer peripheral surface of the inspection encoder 10b is the state quantity measuring device as in the case of the above-described invention. Need not be the same as the pitch of the encoder 4 (see FIG. 10). However, making the pitches of the two encoders 10b and 4 the same means that the positional relationship between the sensors 6a and 6b in the circumferential direction is not performed without performing a conversion process on the difference in pitch between the encoders 10b and 4. It is preferable from the viewpoint of easily determining the suitability of.

[Second Example of Embodiment]
FIG. 2 shows a second example of an embodiment of the present invention corresponding to claims 1, 3 and 9. In this example, a pair of sensors 6a and 6b (see FIG. 1) is an example for a structure including a permanent magnet together with a magnetic sensing element such as a Hall IC, a Hall element, an MR element, and a GMR element. . In the case of this example, since each of the sensors 6a and 6b includes a permanent magnet, a simple magnetic material is used as the inspection encoder 10c. That is, the inspection encoder 10c is formed in a cylindrical shape as a whole by a magnetic metal plate such as a mild steel plate, and each has a slit-shaped through hole in the intermediate portion in the width direction of the outer peripheral surface, which is a detection detection surface. 17a, 17b and column portions 18a, 18b are alternately arranged in the circumferential direction. And each said through-hole 17a, 17b and each said column part in the 1st and 2nd characteristic change area | regions 15a and 16a which are the area | regions of the circumferential direction both half part of this to-be-detected surface for an inspection, respectively. The shape and orientation of the boundaries with 18a and 18b, and the central angle pitch are regulated in the same manner as in the case of the boundary with the inspection encoder 10b of the first example described above. Except for the point that the configuration of the inspection encoder 10c to be used is changed in accordance with the configuration of each of the sensors 6a and 6b, other configurations and operations are the same as those in the case of the first example described above.

[Third example of embodiment]
FIG. 3 shows a third example of the embodiment of the invention corresponding to claims 1, 4 and 9. As in the case of the first example described above, the pair of sensors 6a and 6b (see FIG. 1) includes a magnetic detection element such as a Hall IC, a Hall element, an MR element, and a GMR element. This is an example for a structure that does not include a permanent magnet. In the case of this example, the same encoder as in the second example described above is used as the inspection encoder 10c. When performing the inspection, as shown in FIG. 3, the inspection encoder 10c is provided with an S pole and an N pole at both ends in the radial direction, and is supported and fixed to a portion that does not rotate during the inspection. The permanent magnets 19 are arranged. In this state, one of the magnetic poles (S pole in the illustrated example) of the permanent magnet 19 is detected by the sensors 6a and 6b in the circumferential direction on the inner peripheral surface of the inspection encoder 10c. The part is in close proximity to the part having the same phase as the part. In other words, any one of the magnetic poles of the permanent magnet 19 is opposed to the detection portion of each of the sensors 6a and 6b with a part in the circumferential direction of the inspection encoder 10c interposed therebetween. Thus, when the inspection encoder 10c is rotated with respect to the sensors 6a and 6b and the permanent magnet 19, the output signals of the sensors 6a and 6b are changed based on the magnetic force of the permanent magnet 19. I am trying to do it. In the case of this example, in order to prevent unevenness in the magnetic flux density of the permanent magnet 19 alone, the permanent magnet 19 is related to the circumferential direction of the inspection target surface of the inspection encoder 10c. The width is substantially equal to the length of one pitch of the characteristic change in the first and second characteristic change regions 15a and 16a. Other configurations and operations are the same as those of the first example described above.

In each of the above-described embodiments, as shown in the upper half of FIG. 4, the central angle of the boundary of the characteristic change existing in both the first and second characteristic change areas A ₁ and A ₂ of the inspection encoder E A configuration is adopted in which the pitch (periodic characteristics) is made equal between these two regions A ₁ and A ₂ . However, when such a configuration is adopted, for example, as shown in the upper half of FIG. 4, if both the regions A ₁ and A ₂ are arranged close to each other in the circumferential direction (the left-right direction in FIG. 4), As shown in the lower half, the period of the output signals of the pair of sensors S ₁ and S ₂ is not only the portion corresponding to both the areas A ₁ and A ₂ , but also between these areas A ₁ and A _2. (Ie, over the entire circumference of the inspection target surface) may be equal. In such a case, the determiner uses the output signal generated in the first characteristic change region A ₁ and the output signal generated in the second characteristic change region A ₂ as the period of each output signal. The problem that it becomes impossible to distinguish by seeing is caused. However, even in such a case, if a function for detecting the rotation angle positions of both the areas A ₁ and A ₂ is added to the inspection apparatus, the rotation angle positions of both the areas A ₁ and A ₂ can be detected. from the relationship between the circumferential position of these two regions a _1, the rotational angular position and the sensors S ₁ of a _2, S _2, the output signal of the two sensors S _1, S ₂ is the both regions a _1, It is possible to determine in which region of A ₂ the output signal is generated. However, in this case, there arises a new problem that the cost of the inspection apparatus increases as much as the function for detecting the rotation angle position is added to the inspection apparatus.

On the other hand, if the inspection encoders E _{1 to} E ₅ as shown in the upper half of FIGS. 5 to 9 are used, the pair of sensors S ₁ and S ₁ does not cause the above-described new problem. ₂ output signals {or a phase difference (phase difference ratio) between the output signals of both the sensors S ₁ and S ₂ )} is any of the first and second characteristic change regions A ₁ and A _2. It is possible to easily and surely determine whether the error occurred in the area.

First, in the case of the inspection encoder E ₁ having the configuration corresponding to claim 5 and shown in the upper half portion of FIG. 5, the first and second characteristic change regions A ₁ and A _{2 are located} between the _two. An intermediate region B ₁ is provided in which the periodic characteristics of one half of the width direction (the upper half of the figure) are different from the periodic characteristics of the first and second characteristic change regions A ₁ and A _2. Yes. Specifically, the intermediate region B ₁ of without providing the boundary characteristic change in the width direction piece halves other widthwise half portion only (the lower half of the figure), the first characteristic change region A ₁ The boundary of the characteristic change of the same form (an inclination angle, a center angle pitch) as the other half part of the width direction is provided. If such an inspection encoder E ₁ is used, as shown in the lower half of FIG. 5, the period of the output signal of _one sensor S ₁ corresponds to one half of the width direction of the intermediate region B _1. This part is longer than the part corresponding to both the first and second characteristic change regions A ₁ and A ₂ . For this reason, the output signals of the pair of sensors S ₁ and S ₂ are output in any one of the first and second characteristic change areas A ₁ and A ₂ , using the part where the period is longer as a mark. It is possible to easily determine whether the output signal is generated.
The form of the characteristic change boundary provided in the other half of the width direction of the intermediate area B ₁ is the same as the form of the boundary of the characteristic change existing in the other half of the width direction of the second characteristic change area A _2. You can also do things.

Next, in the case of the inspection encoder E ₂ having the configuration corresponding to claim 6 and shown in the upper half of FIG. 6, the first and second characteristic change areas A ₁ and A ₂ are interposed between each other. The periodic characteristics of the half portions in the width direction of the provided intermediate area B ₂ are different from the periodic characteristics of the first and second characteristic change areas A ₁ and A ₂ . Specifically in this order, the intermediate region B _2, is not provided with boundary characteristic change. When such an inspection encoder E ₂ is used, as shown in the lower half of FIG. 6, the period of the output signals of the pair of sensors S ₁ and S ₂ is a portion corresponding to the intermediate region B _2. The first and second characteristic change areas A ₁ and A ₂ are longer than those corresponding to the first and second characteristic change areas A ₁ and A ₂ . For this reason, the output signals of the sensors S ₁ and S ₂ are generated in any one of the first and second characteristic change areas A ₁ and A ₂ , using the part where the period is longer as a mark. It is possible to easily discriminate whether the output signal has been output.

Next, in the case of the inspection encoder E ₃ having the configuration corresponding to claim 7 and shown in the upper half of FIG. 7, the first and second characteristic change areas A ₁ and A ₂ are interposed between each other. The phase difference characteristic of the provided intermediate area B ₃ is different from the phase difference characteristics of the first and second characteristic change areas A ₁ and A ₂ . For this purpose, specifically, the boundary of the characteristic change provided in the intermediate area B ₃ is provided in the first and second characteristic change areas A ₁ and A ₂ with respect to the width direction of the inspection target surface. It is a straight boundary that is inclined at an angle different from the boundary of the characteristic change. When such an inspection encoder E ₃ is used, as shown in the lower half of FIG. 7, the phase difference between the output signals of the pair of sensors S ₁ and S ₂ is generated in the intermediate region B ₃ . The corresponding portions have different sizes with respect to the portions corresponding to the first and second characteristic change regions A ₁ and A ₂ . For this reason, the phase difference between the output signals of the sensors S ₁ and S ₂ is the first and second characteristic change regions A ₁ , using the portions where the phase differences are different as marks. , A ₂ in which region the phase difference has occurred can be easily discriminated.

Next, in the case of the inspection encoder E ₄ shown in the upper half portion of FIG. 8 which also has the configuration corresponding to the seventh aspect, as in the case of the inspection encoder E ₃ of FIG. , the phase difference characteristics of the intermediate region B ₄ provided between the second double-characteristic change region a _1, a ₂ each other, be different from the those first, phase difference characteristics of the second double-characteristic change region a _1, a ₂ ing. For this purpose, specifically, the form (inclination angle) of the characteristic change boundary provided in both widthwise halves of the intermediate area B ₄ is changed to the characteristic change boundary provided in the second both characteristic change area A ₂ . together equal to the form, in the widthwise half portions of the intermediate region B _4, it is to be shifted from each other the phase boundary of the characteristic change in the circumferential direction. If such an inspection encoder E ₄ is used, as shown in the lower half of FIG. 8, the phase difference between the output signals of the pair of sensors S ₁ and S ₂ is generated in the intermediate region B ₄ . The corresponding portions have different sizes with respect to the portions corresponding to the first and second characteristic change regions A ₁ and A ₂ . For this reason, the phase difference between the output signals of the sensors S ₁ and S ₂ is the first and second characteristic change regions A ₁ , using the portions where the phase differences are different as marks. , A ₂ in which region the phase difference has occurred can be easily discriminated.

When the inspection encoders E _{1 to} E ₄ shown in FIGS. 5 to 8 are implemented, a pair provided on both sides in the circumferential direction of the first characteristic change area A ₁ (second characteristic change area A ₂ ). If the period characteristic or phase difference characteristic of the intermediate region is made different between the two intermediate regions, it is possible to more easily determine in which region the output signal or phase difference is generated. When the present invention is carried out, a pair of intermediate areas provided on both sides in the circumferential direction of the first characteristic change area A ₁ (second characteristic change area A ₂ ) of the inspection encoder are different in the middle. A region (for example, a pair of different intermediate regions selected from the intermediate regions shown in FIGS. 5 to 7 described above) may be employed. Even when such a configuration is adopted, it is possible to more easily determine in which region the output signal or phase difference is generated.

Next, in the case of the inspection encoder E ₅ having the configuration corresponding to claim 8 and shown in the upper half of FIG. 9, the periodic characteristic of the first characteristic change area A ₁ and the second characteristic change area A _{The two} periodic characteristics are different from each other. For this purpose, specifically, the central angle pitch of the boundary of characteristic change provided in the second characteristic change area A ₂ is set to be larger than the central angle pitch of the boundary of characteristic change provided in the first characteristic change area A _1. It is small. If such an inspection encoder E ₅ is used, the period of the output signals of the pair of sensors S ₁ and S ₂ corresponds to the first characteristic change region A ₁ as shown in the lower half of FIG. The portion corresponding to the second characteristic change region A ₂ is shorter than the portion to be processed. For this reason, based on the difference between the periods, the output signals of the sensors S ₁ and S ₂ are generated in any one of the first and second characteristic change areas A ₁ and A _2. Can be easily determined.

Therefore, if the inspection encoders E _{1 to} E ₅ in FIGS. 5 to 9 described above are used, the determination unit outputs the phase difference between the output signals of the pair of sensors S ₁ and S ₂ or between these output signals. It is possible to effectively avoid the occurrence of a problem such as erroneous determination of the occurrence region of the occurrence of the error and a determination error occurring as a result.

  In each of the above-described embodiments, the present invention is applied to a case where a state quantity measuring device that causes a plurality of sensors to face the detection surface of the encoder in the radial direction is an inspection target. However, the present invention is also applicable to a case where a state quantity measuring apparatus in which a plurality of sensors are opposed to the detection surface of the encoder in the axial direction, such as the state quantity measuring apparatus shown in FIG. Applicable.

Sectional drawing which shows the 1st example of embodiment of this invention. The perspective view of the encoder for a test | inspection used when implementing the 2nd example. The perspective view of the test | inspection encoder and permanent magnet used when implementing the 3rd example. The figure which shows an example of the structure which cannot discriminate | determine from the period of this output signal the output signal of the sensor which generate | occur | produced in the 1st characteristic change area | region of the encoder for a test | inspection, and the output signal of the sensor similarly generated in the 2nd characteristic change area | region. The figure which shows the 1st example of the structure which can be discriminate | determined similarly. The figure which shows the 2nd example. The phase difference between the output signals of the pair of sensors generated in the first characteristic change region of the inspection encoder and the phase difference between the output signals of the pair of sensors similarly generated in the second characteristic change region are The figure which shows the 1st example of the structure which can be discriminate | determined from a phase difference. The figure which shows the 2nd example. The figure which shows the 3rd example of a structure which can discriminate | determine the output signal of the sensor which generate | occur | produced in the 1st characteristic change area | region of the encoder for an inspection, and the output signal of the sensor which also occurred in the 2nd characteristic change area | region from this output signal period. . Sectional drawing which shows the 1st example of the state quantity measuring apparatus of the rolling bearing unit known conventionally. Sectional drawing which shows the 2nd example. Sectional drawing which shows the 1st example of the inspection method of a prior invention. The figure which took out a pair of sensor and the encoder for a test | inspection, and was seen from the radial direction. The diagram which shows the change state of the output signal of a pair of sensor accompanying rotation of the encoder for a test | inspection. Sectional drawing which shows the 2nd example of the inspection method of a prior invention. The figure which took out a pair of sensor and the encoder for a test | inspection, and was seen from the radial direction. The diagram which shows the change state of the output signal of a pair of sensor accompanying rotation of the encoder for a test | inspection.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Hub 3 Rolling element 4, 4a Encoder 5 Cover 6a, 6b Sensor 7, 7a Core metal 8, 8a Encoder main body 9 Holder 10, 10a, 10b, 10c Inspection encoder 11 Mounting frame 12 Mounting hole 13 Core metal 14, 14a, 14b inspection encoder body 15,15a first characteristic change region 16,16a second characteristic change region 17 through hole 18 pillar part 19 permanent magnet A ₁ first characteristic change region A ₂ second characteristic change region B ₁ .about.B ₅ the middle area E ₁ to E ₅ test encoder S _1, S ₂ sensor

Claims (9)

A rolling bearing unit and a state quantity measuring device;
Among these, the rolling bearing unit has a stationary side raceway on the stationary side circumferential surface and does not rotate even when used, and a stationary side raceway that has a rotational side raceway on the rotational side circumferential surface and rotates when used. A ring, and a plurality of rolling elements provided between the stationary-side track and the rotating-side track so as to roll freely,
The state quantity measuring device includes an encoder, a sensor device supported and fixed to the stationary raceway ring via a holding member, and a calculator.
Of these, the encoder is supported and fixed to a part of the rotation-side raceway directly or via another member, and has a detection surface concentric with the rotation-side raceway. Are alternately changed in the circumferential direction, and the phase in which the characteristics of the detected surface change in the circumferential direction is continuously changed in the width direction at least in a part of the width direction of the detected surface.
The sensor device includes a plurality of sensors. The detection unit of each sensor is opposed to the detection surface, and the detection unit of at least one of the sensors is disposed on the detection surface. In this state, the holding member is coupled to and fixed to the stationary side race ring in a state where it faces a portion where the phase of the characteristic change continuously changes in the width direction. In addition, each of the sensors changes its output signal in response to a change in characteristics of a portion of the detected surface facing its own detection unit as the rotation-side raceway rotates. Is,
Based on the information on the output signal of each sensor, the computing unit includes a relative displacement between the stationary side raceway and the rotation side raceway and an external force acting between the two raceways. Having a function of calculating at least one state quantity of
Regarding the state quantity measuring device for rolling bearing units,
State quantity measurement of a rolling bearing unit that checks whether the initial phase difference characteristics between the output signals of each sensor and the positional relationship between the sensors in the circumferential direction of the encoder are appropriate. A method for inspecting a device,
An inspection detection surface having the same surface shape as the detection surface of the encoder, the characteristics of the inspection detection surface are alternately changed with respect to the circumferential direction, and the circumferential direction of the detection detection surface is related to In a part of the region, a first characteristic change region in which the boundary of the characteristic change has the same shape and orientation as the boundary of the characteristic change of the detected surface of the encoder and exists at a known pitch in the circumferential direction Similarly, in another part of the region, the boundary of the characteristic change has a linear shape parallel to the width direction of the detection target surface for inspection and exists at a known pitch in the circumferential direction. Before preparing the inspection encoder as the change area and coupling the holding member to the stationary raceway, with the detection part of each sensor facing the inspection detection surface of the inspection encoder, This inspection The coder is rotated at a constant speed with respect to each of these sensors, and the phase difference between the output signals of each of the sensors generated at this time is based on the phase difference generated in the first characteristic change region. The positional relationship between the sensors with respect to the rotation direction of the inspection encoder is determined based on the phase difference generated in the second characteristic change region while determining the suitability of the initial phase difference characteristics between the output signals of the sensors. To determine the suitability of
Inspection method for state quantity measuring device of rolling bearing unit.   The inspection encoder is made of a permanent magnet, and S poles and N poles are alternately arranged on the inspection target surface of the inspection encoder in the circumferential direction of the inspection encoder. Inspection method of state quantity measuring device of rolling bearing unit described.   Each sensor is provided with a permanent magnet, and the inspection encoder is made of a magnetic material. The inspection method of the state quantity measuring device of the rolling bearing unit according to claim 1, wherein the rolling bearing unit is alternately arranged in the circumferential direction.   The inspection encoder is made of a magnetic material, and a solid portion and a thinned portion are alternately arranged on the inspection target surface of the inspection encoder in the circumferential direction of the inspection encoder. The inspection method of the state quantity measuring apparatus of a rolling bearing unit according to claim 1, wherein the magnetic pole of the permanent magnet is arranged at a position facing the detection unit of each sensor across the encoder.   As the inspection encoder, the periodic characteristics of the half halves of the inspection target surface in the width direction are arranged between the first and second characteristic change regions in the circumferential direction of the inspection target surface. The inspection method for the state quantity measuring device for a rolling bearing unit according to any one of claims 1 to 4, wherein an intermediate region made different from the periodic characteristics of the second both characteristic change regions is used. .   As the inspection encoder, the periodic characteristics of the half halves of the inspection target surface in the width direction are arranged between the first and second characteristic change regions in the circumferential direction of the inspection target surface. The inspection method for the state quantity measuring device for a rolling bearing unit according to any one of claims 1 to 4, wherein an intermediate region made different from the periodic characteristics of the second both characteristic change regions is used. .   As an inspection encoder, the phase difference characteristic between the first and second characteristic change areas is set between the first and second characteristic change areas in the circumferential direction of the inspection target surface. The inspection method of the state quantity measuring device of a rolling bearing unit according to any one of claims 1 to 4, wherein a different intermediate region is used.   The state quantity measurement of the rolling bearing unit according to any one of claims 1 to 4, wherein an inspection encoder is used in which the periodic characteristics of the first and second characteristic change regions are different from each other. Device inspection method.   In order to carry out the inspection method of the state quantity measuring device for a rolling bearing unit according to any one of claims 1 to 8, at least an inspection encoder, a support means for supporting a holding member, and this inspection Rotation drive means for rotating the inspection encoder at a constant rotational speed with respect to the sensors while the detection portions of the sensors held by the holding member are opposed to the detection detection surface of the encoder, Among the phase differences between the output signals of the sensors, based on the phase difference generated in the first characteristic change region, the suitability of the initial phase difference characteristics between the output signals of these sensors is determined, and the first A rolling bearing unit comprising: a determination unit that determines appropriateness of a positional relationship between the sensors with respect to a rotation direction of the inspection encoder based on a phase difference generated in a two-characteristic change region. Inspection apparatus of the state quantity measuring device.

Images